Pictures as they are usually produced by a source have more detail and
resolution than the observer can utilize. The phrase "redundant informa-
tion" is often used to denote the information in a picture that may not be
intelligible to the observer. The picture compression schemes discussed in
the first six sections of this chapter are, therefore, called redundancy reduc-
tion techniques. Another commonly used name for these methods is source
encoding, although this name is slightly more general in the sense that it
includes techniques (cf. Section 5.7) derived from information theory that
reconstruc ...
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